001    /*
002     * Copyright (C) 2012 eXo Platform SAS.
003     *
004     * This is free software; you can redistribute it and/or modify it
005     * under the terms of the GNU Lesser General Public License as
006     * published by the Free Software Foundation; either version 2.1 of
007     * the License, or (at your option) any later version.
008     *
009     * This software is distributed in the hope that it will be useful,
010     * but WITHOUT ANY WARRANTY; without even the implied warranty of
011     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012     * Lesser General Public License for more details.
013     *
014     * You should have received a copy of the GNU Lesser General Public
015     * License along with this software; if not, write to the Free
016     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018     */
019    
020    package org.crsh.shell.impl.command;
021    
022    import org.crsh.command.CommandContext;
023    import org.crsh.command.ScriptException;
024    import org.crsh.shell.InteractionContext;
025    import org.crsh.io.Filter;
026    
027    import java.io.IOException;
028    import java.util.Map;
029    
030    /** @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> */
031    class Pipe<C, P> implements Filter<C, P, CommandContext<P>>, CommandContext<C> {
032    
033      /** . */
034      protected CommandContext<P> context;
035    
036      /** . */
037      final Filter<C, P, InteractionContext<P>> command;
038    
039      Pipe(Filter<C, P, InteractionContext<P>> command) {
040        this.command = command;
041      }
042    
043      public final boolean takeAlternateBuffer() throws IOException {
044        return context.takeAlternateBuffer();
045      }
046    
047      public final boolean releaseAlternateBuffer() throws IOException {
048        return context.releaseAlternateBuffer();
049      }
050    
051      public final String getProperty(String propertyName) {
052        return context.getProperty(propertyName);
053      }
054    
055      public final String readLine(String msg, boolean echo) {
056        return context.readLine(msg, echo);
057      }
058    
059      public final int getWidth() {
060        return context.getWidth();
061      }
062    
063      public final int getHeight() {
064        return context.getHeight();
065      }
066    
067      public Map<String, Object> getSession() {
068        return context.getSession();
069      }
070    
071      public Map<String, Object> getAttributes() {
072        return context.getAttributes();
073      }
074    
075      public boolean isPiped() {
076        return context.isPiped();
077      }
078    
079      public Class<P> getProducedType() {
080        return command.getProducedType();
081      }
082    
083      public Class<C> getConsumedType() {
084        return command.getConsumedType();
085      }
086    
087      public void open(CommandContext<P> consumer) {
088        this.context = consumer;
089        this.command.open(consumer);
090      }
091    
092      public void provide(C element) throws IOException {
093        if (command.getConsumedType().isInstance(element)) {
094          command.provide(element);
095        }
096      }
097    
098      public void flush() throws IOException {
099        command.flush();
100      }
101    
102      public void close() throws ScriptException, IOException {
103        command.close();
104      }
105    }